Himura Yuu is a studious and hardworking young man focussed exclusively on preserving his top academic status at Otowa Academy in a narrative set years in the past. He encounters a mystery girl named Amamiya Yuuko one day, and to his amazement, she remembers him. Recollections from a long ago childhood, memories best kept forgotten... Yuu will be forced to confront the regrets and sufferings of their combined pasts and presents if he meets Yuuko again. Kuze Shuuichi may appear to be a womanizer in the present, but upon closer study, he is a guy who would rather be left alone. Hayama Mizuki, on the other hand, is not the sort of lady who would leave him alone, especially after hearing the lovely sounds of his violin performance. Mizuki's efforts to get closer to him, Kuze attempts to push her away—the tale of their budding relationship is darkened with undertones of an imminent tragedy.